SDR ASAA2015061212079

Service difficulty report · Valve · Boeing 737890

Difficulty date: June 12, 2015
Submitted: June 15, 2015
Operation: Air carrier
Aircraft: N535AS
Make and model: Boeing 737890
Aircraft serial: 35200
Aircraft time: 17,402 hours, 5,097 cycles
System (JASC): 3610 · Pneumatic Distribution System
Part: Valve
Part number: 32145526
Part serial: 4052
Condition: Failed
Location: Bleed Sys
Part time: 59,763 hours, 27,286 cycles
Stage of operation: CR
How discovered: O
Nature of condition: J
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

DUCT PRESSURE SPLIT RIGHT WAS 36 PSI, LEFT FLUCTUATED 16-20 PSI AT FL 39000. ACFT GROUNDED. ACCOMPLISHED TASK CARD NG-36WC-00001, ENGINE BLEED AIR SYS HEALTH CHECK. FOUND PRSOV & PRE-COOLER CONTROL VALVE TO HAVE FAILED. REPLACED PRSOV IAW AMM 36-11-04-000-801 & 36-11-04-400-801. REPLACED PRE-COOLER CONTROL VALVE IAW AMM 36-12-02-000-801 & AMM 36-12-02-400-801. COMPLETED ENGINE BLEED AIR CROSSOVER OPS TEST IAW AMM 36-11-00-710-801. OPS CHECKED GOOD.